Add support for get/put reserved regions.
Signed-off-by: Navneet Kumar <[email protected]>
---
drivers/iommu/tegra-smmu.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 4b43c63..e848a45 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -22,6 +22,9 @@
#include <soc/tegra/ahb.h>
#include <soc/tegra/mc.h>
+#define MSI_IOVA_BASE 0x8000000
+#define MSI_IOVA_LENGTH 0x100000
+
struct tegra_smmu_group {
struct list_head list;
const struct tegra_smmu_group_soc *soc;
@@ -882,6 +885,31 @@ static int tegra_smmu_of_xlate(struct device *dev,
return iommu_fwspec_add_ids(dev, &id, 1);
}
+static void tegra_smmu_get_resv_regions(struct device *dev,
+ struct list_head *head)
+{
+ struct iommu_resv_region *region;
+ int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+ region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
+ prot, IOMMU_RESV_SW_MSI);
+ if (!region)
+ return;
+
+ list_add_tail(®ion->list, head);
+
+ iommu_dma_get_resv_regions(dev, head);
+}
+
+static void tegra_smmu_put_resv_regions(struct device *dev,
+ struct list_head *head)
+{
+ struct iommu_resv_region *entry, *next;
+
+ list_for_each_entry_safe(entry, next, head, list)
+ kfree(entry);
+}
+
static const struct iommu_ops tegra_smmu_ops = {
.capable = tegra_smmu_capable,
.domain_alloc = tegra_smmu_domain_alloc,
@@ -896,6 +924,9 @@ static const struct iommu_ops tegra_smmu_ops = {
.iova_to_phys = tegra_smmu_iova_to_phys,
.of_xlate = tegra_smmu_of_xlate,
.pgsize_bitmap = SZ_4K,
+
+ .get_resv_regions = tegra_smmu_get_resv_regions,
+ .put_resv_regions = tegra_smmu_put_resv_regions,
};
static void tegra_smmu_ahb_enable(void)
--
2.7.4
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